Revolving grate for gas producers



Aug. 13, 1929.

G. DIENNE REVOLVING GRATE FOR GAS PRODUCERS Filed July 13, 1925 PatentedAug. 13, 1929.

If Ta s. lf S l? GASTON DIENNE, 0F HAINE ST. IEIERRE, BELGIUM, ASSIGNORTO SOCIETE ANONYME LES ATELIERSlvIECANIQUES, 6Fl-IAYETTES-PAR-MORLANWELZ, BELGIUM.

REVOLVING GRATE FOR GAS PRODUCERS.

Application filed July 13, 1925, Serial N'o.

The present invention relates to an improvement in revolving grates forgas-producers. I,

It has heretofore been customary to provide revolving grates withmultiple concen tric or annular plates or rings revolving in opposed orin the same direction, at different angular speeds, and having uniformlydistributed slots or openings cut therein, the said openings beingcovered by auxiliary elevated covers or projections integral with thegrates, having a grate-like or perforated surface, and of which the walldirected towards the direction of rotation of the grates .is open toallow the discharge or removal of the ashes.

In such known constructions, the auxiliary elevated covers, taking partin the movement of the main grates, efiected the cleaning of the tire inthe annular path covered by their rotation, and the ashes between theseannular paths were discharged or removed through the free space leftbetween the main grates.

Now, according to the present invention, the auxiliary elevated covers'or projections, with or without grate-like or perforated surface, areprovided with an opening in their wall facing the axis of rotation ofthe grates, the object of such opening being to allow the removal in aradial direction of the ashes comprised between't-he annular pathscovered by the elevated covers, due to centrifugal force.

The improved construction referred to makes it possible to eliminateoverlapping of the annular grates, and consequently to avoid thefriction exerted by the ashes on the said grates when passing betweenthe overlap ping portions.

Besides being provided with an opening in their wall facing the axis ofrotation of the grates in order to allow the removal of the ashes in aradial direction, in accordance with the invention, the elevated coversmay still be provided in known manner with an opening in their walldirected towards the direction of rotation of the grates in order toallow the removal of the ashes in a circumferential direction.

Further, according to the invention in a modified form these twoopenings may be combined in the shape of a single opening in a planedisposed obliquely to the radii of tion.

cred by auxiliary elevated covers 3 43,247, and in Belgium September 2,1924.

the grate and turned towards the direction of rotation.

The ash-discharge openings cut in the surface of the grates are disposedin such a manner that when the latter are not in mo-- tion, the ashesare, owing to the elevated auxiliary covers, retained on the grates inthe form of a natural heap.

The movement of rotation of the grates sets'up pressures which determinethe discharge or removal of the ashes through the openingsof theelevated covers directed towards the direction of rotation of the grates(circumferential removal of the ashes) while the centrifugal forceresulting from the movement of the grates pushes the ashes inthe'opening's of the elevated covers directed towards the centre ofrotation of the grates (radial removal of the ashes). 7

In order that it may be more readily understood, the invention is, byway of example, illustrated by the accompanying drawing wherein:

Figure 1 is a half plan of a grate structure wherein the annular gratesare provided ture provided with auxiliary elevated covers accordingto amodified form of the inven- Referring first to Figuresl to 3, the: gratestructure illustrated comprises three concentric revolving annulargrates 1,1, and

1.\ Each of these grates has a number of v ash-discharge openings orslots 2 cut in the surface thereof, and these openings are covwhich areformed'integrally on the grates and in the embodiment illustrated havetheir upper horizontal surface formed as a grate 4. In accordance withthe invention, these eletion of the grates 1, 1 and 1 (this directionbeing indicated by the arrow X, X and X respectievly), but they alsohave a second opening 6 for the removal of the ashes formed in theirwall directed towards the vated covers 3 not only have an opening 5" forthe removal of the ashes formed in then wall directed towards thedirection of rota-' axis of rotation of the grates 1, 1 and 1", i. e. intheir wall facing the centre of the three concentric elevated covers. OnFigures 2 and 3 may be seen how, when the grates are not in motion, theashes remain thereon in the form of a natural heap.

Referring now to Figure 4, in this case the openings for thecircumferential and for the radial removal of the ashes, instead ofbeing independent as in the case of the openings 5 and 6 respectively ofFigure 1, are

combined in the shape of a single opening 7 which as shown is situatedin a plane disposed obliquely to the radii of the grate, and directedtowards the direction of rotation X-Xf of the grates 1, 1, 1.

By arranging the auxiliary elevated covers in the above describedmanner, there are obtained:

1. Zones of radial removal of the ashes in the direction indicated bythe arrows Y on Figures 1 and 4: through the opening in the wall of theelevated covers 3 facing the axis of rotation of the grates;

2. Zones of circumferential removal of the ashes in the directionindicated by the an rows Z on Figures 1 and 4 through the opening in thewall of the elevated covers 3 directed towards the direction of rotation(X, X and X) of the grates;

3. Zones of both radial and circumferential removal of the ashes in thedirections indicated by the arrows Y-Z on Figure 4 through the singleoblique opening of the elevated covers 3 facing the direction ofrotation of the said grates.

There may if desired be arranged on an individual annular grate:

1. Elevated covers permitting the removal of the ashes in a radial andin a circumferential direction by means of two independent openings orby means of a single diagonal opening as described above;

2. Elevated covers permitting the re moval of the ashes in a radialdirection by The above described improved construction of the elevatedcovers, without abandoning any of the advantages of the knownconstructions, procures the following advantages:

1. It enables the combustible to be' brought to all the points of thefire, thus regularizing the combustion and eliminating the formation ofslag and of funnels;

2. It makes it possible to derive the full benefit of the radialmovement of the mass of ashes for the removal or discharge of the ashes,and thus to eliminate the compression of the ashes against the outerwall;

3. Owing to the elimination of the compression of the mass of ashesagainst the outer wall, the harmful influence of the latter becomesnonexistent;

4L. Byregulating thesize and position of the openings in the elevatedcovers, it makes it possible to obtain a uniform cleaning on the wholearea of the fire;

It makes it possible to increase the area of the main grates in view ofthe possibility of establlshlng two zones of removal or discharge of theashes for each grate;

6. The increased area of the grates affords a better support for thelatter; and

7. It eliminates overlapping of the main revolving grates, andconsequently the friction resulting from the passage of the ashesbetween the overlapping portions.

I claim: I

1. In a revolving gas producer grate, comprising a plurality ofindependent concentric rings, holes in said rings, casings formedintegral with the rings over the holes, the upper horizontal surface ofsaid casings being formed as a grate, said casings having a hole in thewall turned towards the direction in which they move, the combination ofan opening of substantial area provided in the walls of the casings andfacing the rotation axis, for the discharge of ashes under the action ofthe centrifugal force.

2. A revolving gas producer grate, com prising a plurality ofindependent concentric rings, holes in said rings, casings formedintegral with the rings over the holes, the upper horizontal surface ofthe casings be ing formed as a grate, an opening provided in the casingsfor the centrifugal removal of ashes, said opening being obliquelydisposed with respect to the radii of the grate and turned towards thedirection of rotation, substantially as described.

In testimony whereof my name.

GASTON DIENNE.

I signed hereunto

